JP4367770B2 - Induction heating method and induction heating coil - Google Patents

Induction heating method and induction heating coil Download PDF

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JP4367770B2
JP4367770B2 JP2004164385A JP2004164385A JP4367770B2 JP 4367770 B2 JP4367770 B2 JP 4367770B2 JP 2004164385 A JP2004164385 A JP 2004164385A JP 2004164385 A JP2004164385 A JP 2004164385A JP 4367770 B2 JP4367770 B2 JP 4367770B2
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induction heating
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嘉昌 田中
武 遠藤
裕 清澤
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Neturen Co Ltd
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Description

本発明は、被加熱物の平坦面のうち所定の環状部分を所定の深さだけ誘導加熱する誘導加熱方法及び誘導加熱コイルに関する。   The present invention relates to an induction heating method and an induction heating coil for induction heating a predetermined annular portion of a flat surface of an object to be heated by a predetermined depth.

平坦面が形成されたワーク（被加熱物）が産業界で広く使用されている。このようなワークの平坦面を環状（リング状）に焼入れすることがある。この焼入れに際しては、平坦面の焼入部分とほぼ同じサイズの円形の誘導加熱コイルを平坦面に向き合わせて配置しておき、この平坦面を環状に所定の深さだけ誘導加熱することにより環状の被加熱部分（以下、環状部分という）を形成してその直後に急冷する。   Work (object to be heated) having a flat surface is widely used in the industry. The flat surface of such a workpiece may be quenched into an annular shape (ring shape). In this quenching, a circular induction heating coil having substantially the same size as the quenching portion of the flat surface is arranged facing the flat surface, and this flat surface is annularly heated by induction heating to a predetermined depth. The part to be heated (hereinafter referred to as an annular part) is formed and immediately cooled immediately thereafter.

ところが、電磁誘導によってワークの環状部分に流れる渦電流はこの環状部分の最短距離を通る傾向にあるので、環状部分のうち内側部分には外側部分よりも多くの渦電流が通ることとなる。この理由は、円形の誘導加熱コイルでは、この誘導加熱コイル径の内側における磁界の強さが近接効果（加熱コイル効果）によってその外側よりも強いからである。この結果、この内側部分は外側部分よりも深くまで焼入温度に加熱されることとなる。従って、焼入硬化層の深さは内側部分では深く、外側部分では浅くなり、一様な深さの焼入硬化層が得られない。   However, since the eddy current flowing through the annular portion of the work by electromagnetic induction tends to pass through the shortest distance of the annular portion, more eddy current passes through the inner portion of the annular portion than the outer portion. This is because in the circular induction heating coil, the strength of the magnetic field inside the induction heating coil diameter is stronger than the outside due to the proximity effect (heating coil effect). As a result, the inner part is heated to a quenching temperature deeper than the outer part. Therefore, the depth of the quench hardened layer is deep in the inner portion and shallow in the outer portion, and a hardened hard layer having a uniform depth cannot be obtained.

ところで、ワークの平坦面の全体に一様な深さの焼入硬化層を形成する技術として、誘導加熱コイルの中心が平坦面の中心から偏心するように誘導加熱コイルを配置しておき、ワークを回転させながらその平坦面を誘導加熱する技術が知られている（特許文献１）。
特公昭５８−３９８８７号公報 By the way, as a technique for forming a hardened and hardened layer having a uniform depth on the entire flat surface of the work, the induction heating coil is arranged so that the center of the induction heating coil is eccentric from the center of the flat surface. A technique is known in which the flat surface is induction-heated while rotating the (Patent Document 1).
Japanese Patent Publication No.58-39887

上記した技術では、ワークの平坦面を環状に焼入れすることができないという問題と、誘導加熱コイルの中心が平坦面の中心から偏心しているのでエネルギー効率が悪いという問題がある。   The above-described technique has a problem that the flat surface of the work cannot be quenched in an annular shape and a problem that the energy efficiency is poor because the center of the induction heating coil is eccentric from the center of the flat surface.

本発明は上記事情に鑑み、ワークの平坦面を環状に一様な深さに誘導加熱できる誘導加熱方法及び誘導加熱コイルを提供することを目的とする。   In view of the above circumstances, an object of the present invention is to provide an induction heating method and an induction heating coil capable of inductively heating a flat surface of a work to an annular uniform depth.

上記目的を達成するための本発明の第１の誘導加熱方法は、被加熱物の平坦面を環状に所定の深さだけ誘導加熱することにより前記平坦面に環状の被加熱部分を形成する誘導加熱方法において、
（１）所定の外径をもつ円弧状の第１誘導加熱コイルを前記平坦面に向き合わせて環状に誘導加熱することにより環状の被加熱部分を形成し、続いて、前記第１誘導加熱コイルの外径と同一又は略同一の内径をもつ円弧状の第２誘導加熱コイルを前記環状の被加熱部分に向き合わせて誘導加熱することを特徴とするものである。 In order to achieve the above object, a first induction heating method of the present invention is an induction heating method in which an annular heated portion is formed on the flat surface by induction heating the flat surface of the object to be heated annularly by a predetermined depth. In the heating method,
(1) An annular heated portion is formed by inductively heating an arc-shaped first induction heating coil having a predetermined outer diameter so as to face the flat surface, and subsequently, the first induction heating coil An arc-shaped second induction heating coil having an inner diameter that is the same as or substantially the same as the outer diameter of the electrode is directed to the annular portion to be heated and is induction-heated.

また、上記目的を達成するための本発明の第２の誘導加熱方法は、被加熱物の平坦面を環状に所定の深さだけ誘導加熱することにより前記平坦面に環状の被加熱部分を形成する誘導加熱方法において、
（２）所定の内径をもつ円弧状の第２誘導加熱コイルを前記平坦面に向き合わせて環状に誘導加熱することにより環状の被加熱部分を形成し、続いて、前記第２誘導加熱コイルの内径と同一又は略同一の外径をもつ円弧状の第１誘導加熱コイルを前記環状の被加熱部分に向き合わせて該環状の被加熱部分を誘導加熱することを特徴とするものである。 Further, the second induction heating method of the present invention for achieving the above object is to form an annular heated portion on the flat surface by induction heating the flat surface of the object to be heated to a predetermined depth. In the induction heating method to
(2) An arc-shaped second induction heating coil having a predetermined inner diameter faces the flat surface to form an annular portion to be heated by induction heating, and then the second induction heating coil An arc-shaped first induction heating coil having the same or substantially the same outer diameter as the inner diameter faces the annular heated portion, and the annular heated portion is induction heated.

また、上記目的を達成するための本発明の第３の誘導加熱方法は、被加熱物の平坦面を環状に所定の深さだけ誘導加熱することにより前記平坦面に環状の被加熱部分を形成する誘導加熱方法において、
（３）所定の外径をもつ円弧状の第１誘導加熱コイルと、該第１誘導加熱コイルの外径と同一又は略同一の内径をもつ円弧状の第２誘導加熱コイルとが連続した略円形の誘導加熱コイルを形成しておき、
（４）該誘導加熱コイルを前記平坦面に向き合わせて配置し、
（５）前記平坦面のいずれかの点を中心にして該誘導加熱コイルと前記被加熱物を相対的に回転させて、前記平坦面を環状に誘導加熱することにより前記平坦面に環状の被加熱部分を形成することを特徴とするものである。 The third induction heating method of the present invention for achieving the above object is to form an annular heated portion on the flat surface by induction heating the flat surface of the object to be heated to a predetermined depth in an annular shape. In the induction heating method to
(3) A substantially continuous arc-shaped first induction heating coil having a predetermined outer diameter and an arc-shaped second induction heating coil having the same or substantially the same inner diameter as the outer diameter of the first induction heating coil. Form a circular induction heating coil,
(4) The induction heating coil is arranged facing the flat surface,
(5) The induction heating coil and the object to be heated are relatively rotated around any point on the flat surface, and the flat surface is annularly heated by induction heating. A heating portion is formed.

ここで、
（６）その中心角が９０°以上３００°以下の範囲内の前記第２誘導加熱コイルを用いてもよい。 here,
(6) You may use the said 2nd induction heating coil in the range whose center angle is 90 degrees or more and 300 degrees or less.

また、上記目的を達成するための本発明の誘導加熱コイルは、被加熱物の平坦面を誘導加熱する誘導加熱コイルにおいて、
（７）所定の外径をもつ円弧状の第１誘導加熱コイルと、
（８）該第１誘導加熱コイルの外径と同一又は略同一の内径をもつ円弧状の第２誘導加熱コイルとを備え、
（９）これら第１及び第２誘導加熱コイルが連続した略円形状であることを特徴とするものである。 An induction heating coil of the present invention for achieving the above object is an induction heating coil for induction heating a flat surface of an object to be heated.
(7) an arc-shaped first induction heating coil having a predetermined outer diameter;
(8) an arc-shaped second induction heating coil having the same or substantially the same inner diameter as the outer diameter of the first induction heating coil;
(9) The first and second induction heating coils have a continuous and substantially circular shape.

ここで、
（１０）前記第２誘導加熱コイルは、その中心角が９０°以上３００°以下の範囲内のものであってもよい。 here,
(10) The second induction heating coil may have a central angle in a range of 90 ° to 300 °.

本発明の誘導加熱方法によれば、先ず、第１誘導加熱コイルで平坦面を環状に誘導加熱する。この誘導加熱では、第１誘導加熱コイルに向き合う平坦面の環状の部分のうちの内側部分ではその外側部分よりも多くの渦電流が通るので、この内側部分が深くまで加熱されるが、外側部分は内側部分よりも浅くしか加熱されない。すなわち、外側部分の被加熱層（外側被加熱層）は内側部分の被加熱層（内側被加熱層）よりも浅い。逆に言えば、内側被加熱層は外側被加熱層よりも深い。このように不均一な（一様でない）深さの被加熱層が形成された環状部分を第２誘導加熱コイルで続けて誘導加熱する。この誘導加熱では、第１誘導加熱コイルの場合と同様に、内側被加熱層が外側被加熱層よりも深くなる。しかし、第２誘導加熱コイルの内径は第１誘導加熱の外径と同一又は略同一であるので、第１誘導加熱コイルで浅くしか加熱されなかった外側被加熱層が、第２誘導加熱コイルの内側被加熱層となって深くまで加熱される。一方、第１誘導加熱コイルで深く加熱された内側被加熱層は、第２誘導加熱コイルではほとんど加熱されない。以上の結果、平坦面のうち環状部分は一様な深さに加熱される。   According to the induction heating method of the present invention, first, the flat surface is induction-heated annularly with the first induction heating coil. In this induction heating, since more eddy current flows in the inner portion of the annular portion of the flat surface facing the first induction heating coil than in the outer portion, the inner portion is heated deeply. Is heated only shallower than the inner part. That is, the heated layer (outer heated layer) in the outer portion is shallower than the heated layer (inner heated layer) in the inner portion. Conversely, the inner heated layer is deeper than the outer heated layer. The annular portion in which the layer to be heated having a non-uniform (non-uniform) depth is formed is continuously induction-heated by the second induction heating coil. In this induction heating, as in the case of the first induction heating coil, the inner heated layer becomes deeper than the outer heated layer. However, since the inner diameter of the second induction heating coil is the same or substantially the same as the outer diameter of the first induction heating coil, the outer heated layer that has been heated only shallowly by the first induction heating coil is It becomes an inner heated layer and is heated deeply. On the other hand, the inner heated layer that is deeply heated by the first induction heating coil is hardly heated by the second induction heating coil. As a result, the annular portion of the flat surface is heated to a uniform depth.

本発明は、被加熱物の平坦面を環状に所定の深さだけ誘導加熱することによりこの平坦面に環状の被加熱部分を形成する技術に実現された。   The present invention has been realized by a technique for forming an annular heated portion on a flat surface by induction heating the flat surface of the object to be heated in an annular shape by a predetermined depth.

図１を参照して、本発明の誘導加熱コイルの一例を説明する。   An example of the induction heating coil of the present invention will be described with reference to FIG.

図１（ａ）は、本発明の一例の誘導加熱コイルを示す平面図であり、（ｂ）は、その側面図である。   Fig.1 (a) is a top view which shows the induction heating coil of an example of this invention, (b) is the side view.

誘導加熱コイル１０は、所定の外径ｒ１をもつ円弧状の第１誘導加熱コイル２０と、この外径ｒ１と同一又は略同一の内径Ｒ２をもつ円弧状の第２誘導加熱コイル３０とを有する。すなわち、ｒ１≒Ｒ２である。なお、外径ｒ１と内径Ｒ２を同じ長さにしてもよい。第１誘導加熱コイル２０と第２誘導加熱コイル３０はともに円弧状であり、共通の中心点Ｃをもっている。第１誘導加熱コイル２０の外径ｒ１と内径ｒ２、及び第２誘導加熱コイル３０の外径Ｒ１と内径Ｒ２は、後述するように被加熱物（ワーク）Ｗの環状部分Ｗ１のサイズ（内径及び外径）によって適宜に決められる。また、第１誘導加熱コイル２０の周方向一端部２０ａは第２誘導加熱コイル３０の周方向一端部３０ａに電気的に接続されており、第１誘導加熱コイル２０の周方向他端部２０ｂは第２誘導加熱コイル３０の周方向他端部３０ｂに電気的に接続されている。このため、誘導加熱コイル１０は、第１誘導加熱コイル２０と第２誘導加熱コイル３０が連続した略円形状に形成されている。第１誘導加熱コイル２０の中心角Θ１は、６０°以下２７０°以上の範囲内であり、第２誘導加熱コイル３０の中心角Θ２は９０°以上３００°以下の範囲内である。なお、常に、中心角Θ１＋中心角Θ２＝３６０°となる。また、内径がＲ２で外径がＲ１となる環状の被加熱層（範囲）とするためには、中心角Θ１≒中心角Θ２≒１８０°にする。   The induction heating coil 10 includes an arc-shaped first induction heating coil 20 having a predetermined outer diameter r1, and an arc-shaped second induction heating coil 30 having an inner diameter R2 that is the same as or substantially the same as the outer diameter r1. . That is, r1≈R2. The outer diameter r1 and the inner diameter R2 may be the same length. The first induction heating coil 20 and the second induction heating coil 30 are both arc-shaped and have a common center point C. The outer diameter r1 and inner diameter r2 of the first induction heating coil 20 and the outer diameter R1 and inner diameter R2 of the second induction heating coil 30 are the sizes (inner diameter and The outer diameter is appropriately determined. In addition, the circumferential one end 20a of the first induction heating coil 20 is electrically connected to the circumferential one end 30a of the second induction heating coil 30, and the circumferential other end 20b of the first induction heating coil 20 is The second induction heating coil 30 is electrically connected to the other circumferential end 30b. For this reason, the induction heating coil 10 is formed in a substantially circular shape in which the first induction heating coil 20 and the second induction heating coil 30 are continuous. The center angle Θ1 of the first induction heating coil 20 is in the range of 60 ° or less and 270 ° or more, and the center angle Θ2 of the second induction heating coil 30 is in the range of 90 ° or more and 300 ° or less. Note that the central angle Θ1 + the central angle Θ2 = 360 ° is always obtained. Further, in order to obtain an annular heated layer (range) having an inner diameter of R2 and an outer diameter of R1, the central angle Θ1≈center angle Θ2≈180 °.

なお、後述する図４に示すように、中心角Θ２が１８０°を超えて３００°以下の場合、第１誘導加熱コイル２０を流れる電流の密度は第２誘導加熱コイル３０のそれよりも少なくなるので、被加熱層の形状が第２誘導加熱コイル３０の形状に近似するものとなり、一方、中心角Θ２が９０°以上１８０°以下の場合、第２誘導加熱コイル３０を流れる電流の電流密度は第１誘導加熱コイル２０のそれよりも少なくなるので、被加熱層の形状が第１誘導加熱コイル２０の形状に近似するものとなる。このような効果は、第１誘導加熱コイル２０と第２誘導加熱コイル３０の(合成コイル)円周上の長さ(面積)比率により得られる効果であり、被加熱層の加熱(焼入)幅を任意に設定可能となる、中心角Θ１と中心角Θ２は、ワークＷの加熱幅を適宜に得るために適正な角度に決定される。   As shown in FIG. 4 to be described later, when the center angle Θ2 exceeds 180 ° and is 300 ° or less, the density of the current flowing through the first induction heating coil 20 is smaller than that of the second induction heating coil 30. Therefore, the shape of the layer to be heated approximates the shape of the second induction heating coil 30. On the other hand, when the central angle Θ2 is 90 ° or more and 180 ° or less, the current density of the current flowing through the second induction heating coil 30 is Since the number is smaller than that of the first induction heating coil 20, the shape of the layer to be heated approximates the shape of the first induction heating coil 20. Such an effect is an effect obtained by the length (area) ratio on the circumference of the (synthetic coil) circumference of the first induction heating coil 20 and the second induction heating coil 30, and heating (quenching) of the heated layer The center angle Θ1 and the center angle Θ2 at which the width can be arbitrarily set are determined as appropriate angles in order to appropriately obtain the heating width of the workpiece W.

第１誘導加熱コイル２０と第２誘導加熱コイル３０の境界部分の一方には電気的絶縁材１２を挟んで一対の導電体１４，１４が接続されており、これら導電体１４，１４は高周波電源（図示せず）に接続されている。この高周波電源から誘導加熱コイル１０に高周波電力が供給されているとき、ある一瞬では矢印Ａ方向に電流が通る。   A pair of conductors 14 and 14 are connected to one of the boundary portions of the first induction heating coil 20 and the second induction heating coil 30 with the electrical insulating material 12 interposed therebetween. (Not shown). When high-frequency power is supplied from the high-frequency power source to the induction heating coil 10, a current passes in the direction of arrow A in a moment.

図２と図３を参照して、誘導加熱コイル１０を用いて被加熱物（ワーク）の平坦面を環状に所定の深さだけ誘導加熱する誘導加熱方法を説明する。   With reference to FIG. 2 and FIG. 3, an induction heating method in which a flat surface of an object to be heated (workpiece) is inductively heated by a predetermined depth in an annular manner using the induction heating coil 10 will be described.

図２（ａ）は、ワークの平坦面に近接させて配置された誘導加熱コイルを示す平面図であり、（ｂ）は、第１誘導加熱コイルのみによって加熱された被加熱層を模式的に示す断面図であり、（ｃ）は、第２誘導加熱コイルのみによって加熱された被加熱層を模式的に示す断面図であり、（ｄ）は、第１及び第２誘導加熱コイルによって加熱された被加熱層を模式的に示す断面図である。図３（ａ）は、ワークの被加熱層と第１誘導加熱コイルの位置関係を模式的に示す断面図であり、（ｂ）は、ワークの被加熱層と第２誘導加熱コイルの位置関係を模式的に示す断面図である。   FIG. 2A is a plan view showing the induction heating coil arranged close to the flat surface of the workpiece, and FIG. 2B schematically shows the heated layer heated only by the first induction heating coil. It is sectional drawing shown, (c) is sectional drawing which shows typically the to-be-heated layer heated only by the 2nd induction heating coil, (d) is heated by the 1st and 2nd induction heating coil. It is sectional drawing which shows the to-be-heated layer typically. FIG. 3A is a cross-sectional view schematically showing the positional relationship between the heated layer of the workpiece and the first induction heating coil, and FIG. 3B shows the positional relationship between the heated layer of the workpiece and the second induction heating coil. It is sectional drawing which shows this typically.

ワークＷの平坦面Ｗａを環状に所定の深さだけ誘導加熱することによりこの平坦面に環状の被加熱部分（環状部分Ｗ１という）を形成する方法を説明する。ここでいう被加熱部分とは、加熱されたときに略同じ（一様な）深さまで略同じ（一様な）温度になる部分をいい、この温度と略同じ温度であってもこの深さよりも浅い部分は被加熱部分には含まれていない。従って、このワークＷを焼入れしたときは、被加熱部分（環状部分Ｗ１）では硬化深さが同じ（一様）になる。   A method for forming an annular heated portion (referred to as an annular portion W1) on the flat surface by induction heating the flat surface Wa of the workpiece W in a ring to a predetermined depth will be described. The heated part here refers to a part that reaches substantially the same (uniform) temperature up to substantially the same (uniform) depth when heated. The shallower part is not included in the heated part. Therefore, when the workpiece W is quenched, the portion to be heated (annular portion W1) has the same (uniform) curing depth.

この環状部分Ｗ１は内径がｒ２であって、第１誘導加熱コイル２０の内径ｒ２に等しい。また、環状部分Ｗ１の外径はｒ３であり、第１誘導加熱コイル２０の外径ｒ１よりも大きくて、第２誘導加熱コイル３０の外径Ｒ１よりも小さい。すなわち、ｒ１<ｒ３<Ｒ１ である。   The annular portion W1 has an inner diameter r2, which is equal to the inner diameter r2 of the first induction heating coil 20. The outer diameter of the annular portion W1 is r3, which is larger than the outer diameter r1 of the first induction heating coil 20 and smaller than the outer diameter R1 of the second induction heating coil 30. That is, r1 <r3 <R1.

誘導加熱コイル１０の中心点Ｃが環状部分Ｗ１の中心点Ｃ’（本発明にいう平坦面のいずれかの点の一例である）に一致するように、環状部分Ｗ１の上方に近接させて誘導加熱コイル１０を配置する。その後、高周波電源から誘導加熱コイル１０に電力を供給しながら誘導加熱コイル１０とワークＷを相対的に回転させる。ここでは、環状部分Ｗ１の中心点Ｃ’を中心にしてワークＷを回転させた。   The induction heating coil 10 is guided close to the top of the annular portion W1 so that the center point C of the induction heating coil 10 coincides with the center point C ′ of the annular portion W1 (which is an example of any point on the flat surface according to the present invention). A heating coil 10 is disposed. Thereafter, the induction heating coil 10 and the work W are relatively rotated while power is supplied to the induction heating coil 10 from the high frequency power source. Here, the workpiece W is rotated around the center point C ′ of the annular portion W1.

第１誘導加熱コイル２０のみによる誘導加熱の場合、図２（ｂ）及び図３（ａ）に示すように、環状部分Ｗ１のうち第１誘導加熱コイル２０のほぼ真下に相当する部分（被加熱部分）Ｈ１のみが誘導加熱される。この場合、被加熱部分Ｈ１のうちの内側部分Ｈ１ａではその外側部分Ｈ１ｂよりも多くの渦電流が通るので、図２（ｂ）に示すように、この内側部分Ｈ１ａが深くまで加熱されるが、外側部分Ｈ１ｂは内側部分Ｈ１ａよりも浅くしか加熱されない。すなわち、外側部分Ｈ１ｂの被加熱層（外側被加熱層Ｈ１ｂとする）は内側部分Ｈ１ａの被加熱層（内側被加熱層Ｈ１ａとする）よりも浅い。逆に言えば、内側被加熱層Ｈ１ａは外側被加熱層Ｈ１ｂよりも深い。   In the case of induction heating using only the first induction heating coil 20, as shown in FIGS. 2 (b) and 3 (a), a portion of the annular portion W1 that is substantially directly below the first induction heating coil 20 (to be heated) Part) Only H1 is induction heated. In this case, since more eddy current passes through the inner portion H1a of the heated portion H1 than the outer portion H1b, the inner portion H1a is heated deeply as shown in FIG. The outer part H1b is heated only shallower than the inner part H1a. That is, the heated layer of the outer portion H1b (referred to as the outer heated layer H1b) is shallower than the heated layer of the inner portion H1a (referred to as the inner heated layer H1a). In other words, the inner heated layer H1a is deeper than the outer heated layer H1b.

上記と同様に、第２誘導加熱コイル３０のみによる誘導加熱の場合、図２（ｃ）に示すように、環状部分Ｗ１のうち第２誘導加熱コイル３０のほぼ真下に相当する部分（被加熱部分）Ｈ２のみが誘導加熱される。この場合、被加熱部分Ｈ２のうちの内側部分Ｈ２ａではその外側部分Ｈ２ｂよりも多くの渦電流が通るので、この内側部分Ｈ２ａが深くまで加熱されるが、外側部分Ｈ２ｂは内側部分Ｈ２ａよりも浅くしか加熱されない。すなわち、外側部分Ｈ２ｂの被加熱層（外側被加熱層Ｈ２ｂとする）は内側部分Ｈ２ａの被加熱層（内側被加熱層Ｈ２ａとする）よりも浅い。逆に言えば、内側被加熱層Ｈ２ａは外側被加熱層Ｈ２ｂよりも深い。   Similarly to the above, in the case of induction heating only by the second induction heating coil 30, as shown in FIG. 2 (c), a portion (a portion to be heated) corresponding to the annular portion W1 substantially directly below the second induction heating coil 30. ) Only H2 is induction heated. In this case, since more eddy current passes through the inner portion H2a of the heated portion H2 than the outer portion H2b, the inner portion H2a is heated deeply, but the outer portion H2b is shallower than the inner portion H2a. Only heated. That is, the heated layer of the outer portion H2b (referred to as the outer heated layer H2b) is shallower than the heated layer of the inner portion H2a (referred to as the inner heated layer H2a). In other words, the inner heated layer H2a is deeper than the outer heated layer H2b.

上述したように誘導加熱コイル１０の中心点Ｃが環状部分Ｗ１の中心点Ｃ’に一致するように、環状部分Ｗ１の上方に近接させて誘導加熱コイル１０を配置しておき、高周波電源から誘導加熱コイル１０に電力を供給しながら環状部分Ｗ１の中心点Ｃ’を中心にしてワークＷを回転させる。これにより、ワークＷが回転し始めた直後には、環状部分Ｗ１のうち第１誘導加熱２０に向き合っている部分（例えばＨ１に相当する部分）では、先ず、図２（ｂ）及び図３（ａ）に示すように被加熱部分Ｈ１が形成される。その後、ワークＷの回転に伴って、被加熱部分Ｈ１に重なって（重畳して）被加熱部分Ｈ２が形成される。この結果、図２（ｄ）と図３（ｂ）に示すように環状部分Ｗ１には一様な深さの被加熱層Ｈ３が形成される。   As described above, the induction heating coil 10 is arranged close to the upper portion of the annular portion W1 so that the center point C of the induction heating coil 10 coincides with the center point C ′ of the annular portion W1, and induction from the high frequency power source is performed. While supplying electric power to the heating coil 10, the workpiece W is rotated about the center point C ′ of the annular portion W1. As a result, immediately after the workpiece W starts to rotate, the portion of the annular portion W1 facing the first induction heating 20 (for example, the portion corresponding to H1) is first shown in FIGS. As shown in a), a heated portion H1 is formed. Thereafter, with the rotation of the workpiece W, the heated portion H2 is formed so as to overlap (superimpose) the heated portion H1. As a result, as shown in FIGS. 2D and 3B, the heated layer H3 having a uniform depth is formed in the annular portion W1.

一方、ワークＷが回転し始めた直後には、環状部分Ｗ１のうち第２誘導加熱コイル３０に向き合っている部分（例えばＨ２に相当する部分）では、先ず、図２（ｃ）に示すように被加熱部分Ｈ２が形成される。その後、ワークＷの回転に伴って、被加熱部分Ｈ２に重なって（重畳して）被加熱部分Ｈ１が形成される。この結果、図２（ｄ）と図３（ｂ）に示すように、環状部分Ｗ１には一様な深さの被加熱層Ｈ３が形成される。ワークＷを繰り返して回転させることにより被加熱部分Ｈ１と被加熱部分Ｈ２が繰り返して形成される。この結果、環状部分Ｗ１には一様な深さの被加熱層Ｈ３がいっそう確実に形成されることとなる。   On the other hand, immediately after the workpiece W starts to rotate, a portion of the annular portion W1 facing the second induction heating coil 30 (for example, a portion corresponding to H2) is first shown in FIG. A heated portion H2 is formed. Thereafter, with the rotation of the workpiece W, the heated portion H1 is formed so as to overlap (superimpose) the heated portion H2. As a result, as shown in FIGS. 2D and 3B, the heated layer H3 having a uniform depth is formed in the annular portion W1. By repeatedly rotating the workpiece W, the heated portion H1 and the heated portion H2 are repeatedly formed. As a result, the heated layer H3 having a uniform depth is more reliably formed in the annular portion W1.

なお、ワークＷが鋼製であって被加熱層Ｈ３を焼入温度まで一様に加熱した直後に、この被加熱層Ｈ３に冷却液を噴射して急冷することにより環状部分Ｗ１には一様な深さ（図２（ｄ）のｈで示す深さ）の硬化層が得られることとなる。   In addition, immediately after the workpiece W is made of steel and the heated layer H3 is uniformly heated to the quenching temperature, the cooling liquid is sprayed onto the heated layer H3 and rapidly cooled to uniformly form the annular portion W1. A hardened layer having a certain depth (depth indicated by h in FIG. 2D) is obtained.

図４を参照して、上記の中心角Θ２が変化することに起因して被加熱層の幅を変える技術を説明する。   With reference to FIG. 4, a technique for changing the width of the heated layer due to the change in the central angle Θ2 will be described.

図４は、中心角Θ２を変化させることにより幅が変わった被加熱層を示す模式図であり、（ａ）は、中心角Θ２が１８０°（中心角Θ１も１８０°）のときの被加熱層を示し、（ｂ）は、中心角Θ２が３００°（中心角Θ１は６０°）のときの被加熱層を示し、（ｃ）は、中心角Θ２が９０°（中心角Θ１は２７０°）のときの被加熱層を示す。この図では、図２に示す構成要素と同一の構成要素には同一の符号が付されている。   FIG. 4 is a schematic view showing a heated layer whose width is changed by changing the central angle Θ2, and (a) is a heated layer when the central angle Θ2 is 180 ° (the central angle Θ1 is also 180 °). (B) shows the heated layer when the central angle Θ2 is 300 ° (the central angle Θ1 is 60 °), and (c) shows the central angle Θ2 is 90 ° (the central angle Θ1 is 270 °). The heated layer at the time of) is shown. In this figure, the same components as those shown in FIG. 2 are denoted by the same reference numerals.

中心角Θ１＝中心角Θ２＝１８０°の場合は、（ａ）に示すように、内径ｒ２で外径Ｒ１となる広い幅の環状で一様な深さの被加熱層Ｈ４が得られる。中心角Θ２＝３００°で中心角Θ１＝６０°の場合は、第１誘導加熱コイル２０を流れる電流の密度は第２誘導加熱コイル３０のそれよりも少なくなるので、（ｂ）に示すように被加熱層の形状が第２誘導加熱コイル３０の形状に近似するものとなり、内径Ｒ２で外径Ｒ１となる環状で一様な深さの被加熱層Ｈ５が得られる。中心角Θ２＝９０°で中心角Θ１＝２７０°の場合は、第２誘導加熱コイル３０を流れる電流の電流密度は第１誘導加熱コイル２０のそれよりも少なくなるので、（ｃ）に示すように、内径ｒ２で外径ｒ１となる環状で一様な深さの被加熱層Ｈ６が得られる。   When the central angle Θ1 = the central angle Θ2 = 180 °, as shown in (a), the heated layer H4 having a large width and a uniform depth having an inner diameter r2 and an outer diameter R1 is obtained. When the central angle Θ2 = 300 ° and the central angle Θ1 = 60 °, the density of the current flowing through the first induction heating coil 20 is smaller than that of the second induction heating coil 30, so that as shown in FIG. The shape of the heated layer approximates the shape of the second induction heating coil 30, and an annular heated layer H5 having an inner diameter R2 and an outer diameter R1 is obtained. When the central angle Θ2 = 90 ° and the central angle Θ1 = 270 °, the current density of the current flowing through the second induction heating coil 30 is smaller than that of the first induction heating coil 20, so as shown in FIG. In addition, a layer to be heated H6 having an annular and uniform depth with an inner diameter r2 and an outer diameter r1 is obtained.

（ａ）は、本発明の一例の誘導加熱コイルを示す平面図であり、（ｂ）は、その側面図である。(A) is a top view which shows the induction heating coil of an example of this invention, (b) is the side view. （ａ）は、ワークの平坦面に近接させて配置された誘導加熱コイルを示す平面図であり、（ｂ）は、第１誘導加熱コイルのみによって加熱された被加熱層を模式的に示す断面図であり、（ｃ）は、第２誘導加熱コイルのみによって加熱された被加熱層を模式的に示す断面図であり、（ｄ）は、第１及び第２誘導加熱コイルによって加熱された被加熱層を模式的に示す断面図である。(A) is a top view which shows the induction heating coil arrange | positioned close to the flat surface of a workpiece | work, (b) is a cross section which shows the to-be-heated layer heated only by the 1st induction heating coil. (C) is a cross-sectional view schematically showing a heated layer heated only by the second induction heating coil, and (d) is a drawing showing the heated layer heated by the first and second induction heating coils. It is sectional drawing which shows a heating layer typically. （ａ）は、ワークの被加熱層と第１誘導加熱コイルの位置関係を模式的に示す断面図であり、（ｂ）は、ワークの被加熱層と第２誘導加熱コイルの位置関係を模式的に示す断面図である。(A) is sectional drawing which shows typically the positional relationship of the to-be-heated layer of a workpiece | work, and a 1st induction heating coil, (b) is a schematic diagram of the positional relationship of the to-be-heated layer of a workpiece | work, and a 2nd induction heating coil. FIG. 中心角Θ２を変化させることにより幅が変わった被加熱層を示す模式図であり、（ａ）は、中心角Θ２が１８０°（中心角Θ１も１８０°）のときの被加熱層を示し、（ｂ）は、中心角Θ２が３００°（中心角Θ１は６０°）のときの被加熱層を示し、（ｃ）は、中心角Θ２が９０°（中心角Θ１は２７０°）のときの被加熱層を示す。It is a schematic diagram showing a heated layer whose width is changed by changing the central angle Θ2, (a) shows the heated layer when the central angle Θ2 is 180 ° (the central angle Θ1 is also 180 °), (B) shows the heated layer when the central angle Θ2 is 300 ° (the central angle Θ1 is 60 °), and (c) shows the case when the central angle Θ2 is 90 ° (the central angle Θ1 is 270 °). The heated layer is shown.

符号の説明Explanation of symbols

１０ 誘導加熱コイル
２０ 第１誘導加熱コイル
３０ 第２誘導加熱コイル 10 induction heating coil 20 first induction heating coil 30 second induction heating coil

Claims (6)

被加熱物の平坦面のうちその外周縁よりも内側の部分を環状に誘導加熱することにより前記平坦面に環状の被加熱部分を形成する誘導加熱方法において、
前記環状の被加熱部分の中心から該環状の被加熱部分のうち幅方向中央部までの長さと同一又は略同一の外径及び前記環状の被加熱部分の内径と同一又は略同一の内径をもつ円弧状の第１誘導加熱コイルを前記平坦面に向き合わせて誘導加熱し、前記第１誘導加熱コイルの外径と同一又は略同一の内径及び前記環状の被加熱部分の外径と同一又は略同一の外径をもつと共に前記第１誘導加熱コイルに連続して略円形を形成する円弧状の第２誘導加熱コイルを前記平坦面に向き合わせて誘導加熱する際に、前記略円形を形成する前記第１及び第２誘導加熱コイルの円弧の中心角を変えることにより前記環状の被加熱部分の幅を変えることを特徴とする誘導加熱方法。 In the induction heating method of forming an annular heated portion on the flat surface by inductively heating a portion inside the outer peripheral edge of the flat surface of the object to be heated,
It has the same or substantially the same outer diameter as the length from the center of the annular heated portion to the center in the width direction of the annular heated portion, and the same or substantially the same inner diameter as the inner diameter of the annular heated portion. An arc-shaped first induction heating coil is induction-heated facing the flat surface, and has the same or substantially the same inner diameter as the outer diameter of the first induction heating coil and the outer diameter of the annular heated portion. When the arc-shaped second induction heating coil having the same outer diameter and continuously forming the circular shape continuously with the first induction heating coil faces the flat surface and induction heats, the substantially circular shape is formed. An induction heating method, wherein a width of the annular heated portion is changed by changing a central angle of an arc of the first and second induction heating coils. 被加熱物の平坦面のうちその外周縁よりも内側の部分を環状に誘導加熱することにより前記平坦面に環状の被加熱部分を形成する誘導加熱方法において、
前記環状の被加熱部分の中心から該環状の被加熱部分のうち幅方向中央部までの長さと同一又は略同一の内径及び前記環状の被加熱部分の外径と同一又は略同一の外径をもつ円弧状の第２誘導加熱コイルを前記平坦面に向き合わせて誘導加熱し、前記第２誘導加熱コイルの内径と同一又は略同一の外径及び前記環状の被加熱部分の内径と同一又は略同一の内径をもつと共に前記第２誘導加熱コイルに連続して略円形を形成する円弧状の第１誘導加熱コイルを前記平坦面に向き合わせて誘導加熱する際に、前記略円形を形成する前記第１及び第２誘導加熱コイルの円弧の中心角を変えることにより前記環状の被加熱部分の幅を変えることを特徴とする誘導加熱方法。 In the induction heating method of forming an annular heated portion on the flat surface by inductively heating a portion inside the outer peripheral edge of the flat surface of the object to be heated,
An inner diameter that is the same or substantially the same as the length from the center of the annular heated portion to the center in the width direction of the annular heated portion, and an outer diameter that is the same or substantially the same as the outer diameter of the annular heated portion. The second induction heating coil having an arc shape is induction-heated by facing the flat surface, and has the same or substantially the same outer diameter as the inner diameter of the second induction heating coil and the inner diameter of the annular heated portion. When the arc-shaped first induction heating coil having the same inner diameter and continuously forming a circular shape continuously with the second induction heating coil faces the flat surface for induction heating, the circular shape is formed. An induction heating method, wherein the width of the annular heated portion is changed by changing the central angle of the arcs of the first and second induction heating coils. 被加熱物の平坦面のうちその外周縁よりも内側の部分を環状に誘導加熱することにより前記平坦面に環状の被加熱部分を形成する誘導加熱方法において、
前記環状の被加熱部分の中心から該環状の被加熱部分のうち幅方向中央部までの長さと同一又は略同一の外径及び前記環状の被加熱部分の内径と同一又は略同一の内径をもつ円弧状の第１誘導加熱コイルと、該第１誘導加熱コイルの外径と同一又は略同一の内径及び前記環状の被加熱部分の外径と同一又は略同一の外径をもつと共に前記第１誘導加熱コイルに連続して略円形を形成する円弧状の第２誘導加熱コイルとを用意しておき、
前記略円形を形成する前記第１及び第２誘導加熱コイルの円弧の中心角を変えることにより前記環状の被加熱部分の幅を変えることを特徴とする誘導加熱方法。 In the induction heating method of forming an annular heated portion on the flat surface by inductively heating a portion inside the outer peripheral edge of the flat surface of the object to be heated,
It has the same or substantially the same outer diameter as the length from the center of the annular heated portion to the center in the width direction of the annular heated portion, and the same or substantially the same inner diameter as the inner diameter of the annular heated portion. An arc-shaped first induction heating coil, an inner diameter that is the same or substantially the same as the outer diameter of the first induction heating coil, and an outer diameter that is the same or substantially the same as the outer diameter of the annular heated portion, and the first An arc-shaped second induction heating coil that forms a substantially circular shape continuously with the induction heating coil;
An induction heating method, wherein a width of the annular heated portion is changed by changing a central angle of an arc of the first and second induction heating coils forming the substantially circular shape. 前記中心角が９０°以上３００°以下の範囲内の前記第２誘導加熱コイルを用いることを特徴とする請求項１，２，又は３に記載の誘導加熱方法。 4. The induction heating method according to claim 1, wherein the second induction heating coil has a central angle in a range of 90 ° to 300 °. 被加熱物の平坦面のうちその外周縁よりも内側の部分を環状に誘導加熱することにより前記平坦面に環状の被加熱部分をその幅を変えて形成するための誘導加熱コイルにおいて、
前記環状の被加熱部分の中心から該環状の被加熱部分のうち幅方向中央部までの長さと同一又は略同一の外径及び前記環状の被加熱部分の内径と同一又は略同一の内径をもつ円弧状の第１誘導加熱コイルと、
前記環状の被加熱部分の外径と同一又は略同一の外径及び前記第１誘導加熱コイルの外径と同一又は略同一の内径をもつと共に前記第１誘導加熱コイルに連続して略円形を形成する円弧状の第２誘導加熱コイルとを備え、
その中心が前記環状の被加熱部分の中心に一致するように前記略円形を形成する前記第１及び第２誘導加熱コイルは、
それぞれの円弧の中心角の合計が３６０°を満たすように組み合わされた前記第１及び第２誘導加熱コイルで略円形を形成して前記被加熱物を回転させながら前記被加熱部分を誘導加熱することにより該被加熱部分の幅を変えるものであることを特徴とする誘導加熱コイル。 In an induction heating coil for forming an annular heated portion on the flat surface by changing its width by inductively heating a portion inside the outer peripheral edge of the flat surface of the object to be heated,
It has the same or substantially the same outer diameter as the length from the center of the annular heated portion to the center in the width direction of the annular heated portion, and the same or substantially the same inner diameter as the inner diameter of the annular heated portion. An arc-shaped first induction heating coil;
It has an outer diameter that is the same or substantially the same as the outer diameter of the annular part to be heated and an inner diameter that is the same or substantially the same as the outer diameter of the first induction heating coil, and has a substantially circular shape continuously to the first induction heating coil. An arc-shaped second induction heating coil to be formed,
The first and second induction heating coils that form the substantially circular shape so that the center thereof coincides with the center of the annular heated portion ,
The first and second induction heating coils combined so that the total central angle of each arc satisfies 360 ° is formed into a substantially circular shape, and the heated portion is induction heated while rotating the heated object. induction heating coil, characterized in that changing the width of the heated portion by. 前記第２誘導加熱コイルは、
前記中心角が９０°以上３００°以下の範囲内のものであることを特徴とする請求項５に記載の誘導加熱コイル。 The second induction heating coil is
The induction heating coil according to claim 5, wherein the central angle is in a range of 90 ° to 300 °.
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